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\bibitem{Yu_etal2004} Yu, B., Zeng, F., Yang, Y., Xing, Q., Chechin, A., Xin, X., et al. (2004). Torsional vibrational modes of tryptophan studied by terahertz time-domain spectroscopy. \textit{Biophys. J.}, \textit{86}(3), 1649--1654.

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